linux-kernel - [PATCH 3.16 093/212] usb: misc: adutux: remove redundant error check on copy_to

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Message-ID: <lsq.1496331796.576317351@decadent.org.uk>
Date:   Thu, 01 Jun 2017 16:43:16 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Colin Ian King" <colin.king@...onical.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Subject: [PATCH 3.16 093/212] usb: misc: adutux: remove redundant error
 check on copy_to_user return code

3.16.44-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Colin Ian King <colin.king@...onical.com>

commit 453785c64e090d9b4169636b7276fcd6d7489d33 upstream.

The 2nd check for a non-zero return from copy_to_user is redundant as
it is has already been made a few lines earlier.  This check was made
redundant because of previous fix to the copy_to_user error return
check.

Detected by CoverityScan, CID#114347 ("Logically Dead Code")

Fixes: 1865a9c382ede ("USB: adutux: fix misuse of return value of copy_to_user()")

Signed-off-by: Colin Ian King <colin.king@...onical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/misc/adutux.c | 4 ----
 1 file changed, 4 deletions(-)

--- a/drivers/usb/misc/adutux.c
+++ b/drivers/usb/misc/adutux.c
@@ -389,10 +389,6 @@ static ssize_t adu_read(struct file *fil
 			dev->secondary_head += (amount - i);
 			bytes_read += (amount - i);
 			bytes_to_read -= (amount - i);
-			if (i) {
-				retval = bytes_read ? bytes_read : -EFAULT;
-				goto exit;
-			}
 		} else {
 			/* we check the primary buffer */
 			spin_lock_irqsave (&dev->buflock, flags);